You are correct, other than your typo.  The centric zone in a
monoclinic space group (B setting) is h0l.

   This web site is a wiki so you should be able to correct it yourself.

Dale Tronrud

On 3/2/2019 2:00 PM, Edward A. Berry wrote:
> The wiki:
> 
> https://strucbio.biologie.uni-konstanz.de/ccp4wiki/index.php/Centric_and_acentric_reflections
> 
> 
> says:
> "A reflection is centric if there is a reciprocal space symmetry
> operator which maps it onto itself (or rather its Friedel mate).
> . . .
> Centric reflections in space group P2 and P21 are thus those with 0,k,0."
> 
> The operator -h,k,-l does NOT take 0,k,0 to its Friedel mate.
> it takes h,0,k to their Friedel mates. In other words the plane
> perpendicular to the 2-fold axis, at 0 along the axis
> 
> Or am I missing something?
> eab
> 
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